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<title>operator+,-(ranges::transform_view::iterator)</title>
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<h1 id="firstHeading" class="firstHeading">operator+,-<span style="font-size:0.7em; line-height:130%">(ranges::transform_view::<i>iterator</i>)</span></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-ranges.html">ranges</a>‎ | <a href="cpp-ranges-transform_view.html">transform view</a>‎ | <a href="cpp-ranges-transform_view-iterator.html">iterator</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="coMULTI">/*iterator*/</span> operator<span class="sy2">+</span><span class="br0">(</span> <span class="coMULTI">/*iterator*/</span> i, difference_type n <span class="br0">)</span><br />
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requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="coMULTI">/*iterator*/</span> operator<span class="sy2">+</span><span class="br0">(</span> difference_type n, <span class="coMULTI">/*iterator*/</span> i <span class="br0">)</span><br />
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requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="coMULTI">/*iterator*/</span> operator<span class="sy2">-</span><span class="br0">(</span> <span class="coMULTI">/*iterator*/</span> i, difference_type n <span class="br0">)</span><br />
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requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> difference_type operator<span class="sy2">-</span><span class="br0">(</span> <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> x,<br /></span>
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<p> <span class="kw4">const</span> <span class="coMULTI">/*iterator*/</span><span class="sy3">&</span> y <span class="br0">)</span><br /></p>
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requires ranges<span class="sy4">::</span><span class="me2">random_access_range</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="sy4">;</span></div>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div class="t-li1"><span class="t-li">1,2)</span> 返回增加 <code>n</code> 的 <code>i</code> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 返回减少 <code>n</code> 的 <code>i</code> 。</div>
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<div class="t-li1"><span class="t-li">4)</span> 返回 <code>x</code> 与 <code>y</code> 间的距离。</div>
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<p>这些函数对通常<a href="cpp-language-unqualified_lookup.html">无限定</a>或<a href="cpp-language-qualified_lookup.html">有限定查找</a>不可见，而只能在 <code>transform_view::<i>iterator</i><Const></code> 为参数的关联类时由<a href="cpp-language-adl.html">实参依赖查找</a>找到。</p>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>令 <code>parent_</code> 代表指向亲 <code>transform_view</code> 的指针， <code>current_</code> 代表底层迭代器。</p>
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<div class="t-li1"><span class="t-li">1,2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*iterator*/</span><span class="br0">{</span><span class="sy2">*</span>i.<span class="me1">parent_</span>, i.<span class="me1">current_</span> <span class="sy2">+</span> n<span class="br0">}</span></span></span></div>
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<div class="t-li1"><span class="t-li">3)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*iterator*/</span><span class="br0">{</span><span class="sy2">*</span>i.<span class="me1">parent_</span>, i.<span class="me1">current_</span> <span class="sy2">-</span> n<span class="br0">}</span></span></span></div>
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<div class="t-li1"><span class="t-li">4)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">current_</span> <span class="sy2">-</span> y.<span class="me1">current_</span></span></span></div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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